T5 gearbox conversion

Barwick10 · 2015-01-12T08:51:19+00:00

Cut from my turbo bricks post forums.turbobricks.com/showthread.php?t=244360&highlight=australian+t5%2A Lets look at what common world class T5 boxes ar...

Barwick10

I couldn't tell you as yet Bob as I don't actually have the box in question. I was trying to make sure it was suitable before I brought it.

Major Ledfoot

It might be worth asking the seller to give you the tag number of the box. It would be interesting if the same number turns up on any of the numerous US-centric T5 application lists, like this one for example.

67-72chevytrucks.com/vboard/showthread.php?t=311573

It's worth noting (or repeating) that the tag number (or the sticker on top of the box) is the means of identifying the part number of a transmission; the 1352 numbers cast into bits of the transmission casing itself only identify the casing part number, and they're often shared across several different transmissions in the T5 family.

See pictures below, as first posted on Turbobricks -

If the tag is missing, it may mean it's had a little surgery in its past.

The third gear oil relief trick however is one operation that all T5s ought to have for longevity.

deleted_user_160

We worked out that unless you are going for big big HP. We are not going to break any of the T5 boxes under spirited driving conditions. All the aussie t5 excluding EA generation I've been informed are World class.

And commodore v6 being the longest housing (which is the key issue we face) if you look in our thread about the conversion we have done. Even the longest box available, is still technically too short. And factory shifter position is very far forward. A custom or short shifter is required for everything to work in the 7series.
2 series should be a better fit.

If I had the spare time and extra cash I would have done the 5th gear counter balance weight. This increases the life and torque of 5th which has a habit of blowing in a lot a f cases

Vee_Que

The t56 runs an offset shifter linkage out of the box that would be perfect for the 740 manual swap. If it fits. But I saw it on a vx commodore with a t56.

deleted_user_160

T56 runs. The offset shifter, with adjustment holes in the shifter surround top plate. (That was on the t56 I had)
But like you and yoshifab both mentioned. The ratios are miles off. And would be a slug to drive. Unless you changed the gear ratios in the box of course.

Vee_Que

I mean to fit the offset shifter from the t56 ON a T5.

deleted_user_160

Would it work? . :/ we should have looked into it.

Major Ledfoot

A T5 parts catalog would be very useful in helping to resolve the shifter location issue in placing a T5 family gearbox into a 700.

For example, the picture below is of a 1352-261 T5 gearbox as fitted to the SsangYong Korando diesel.
.
.

.
.
While the torque rating of this unit is relatively low, the shifter extension housing and gearbox top cover are of interest, since the specification of this box indicates it has a bellhousing face to shifter centreline measurement of 599.7 mm - or 23.6 inches, which IIRC makes the shifter location <strike> ideal </strike> closer to ideal for 700s.

Putting together a hybrid gearbox, using this box's top cover and shifter arrangement placed on a stronger box from the T5 family, might be a hassle-free way of getting around the shifter position issue - IF the parts are compatible.

(edited for accuracy)

deleted_user_160

Interesting shifter mech

Major Ledfoot

More dimensions -

Thickness of the DeeWorks / Yoshifab adapter plate = 5/8 or 0.625 inch (16 mm)

700 series, M46 - measurement from front face of transmission to centre line of shift lever = 24.5 inches (623 mm)

deleted_user_160

you can also contact alex - @Vee_Que‌ regarding the adaptor plate if you want one made locally. i have given him all the cad documents required. and he has done one already.

jonbot

something of a resurrect

i picked up a 5sp tremec thing that was in a BA 6 cyl, measured box face to shifter at 24.5"

will be a while till im looking at fitting it, will report back once its going in

has internal slave too, not that that is all that much use to me

deleted_user_160

Looks like you might have the best t5 box you can get.
And might be the longest of them all as well. But are worth $$$$

By chance did you get an exhaust hanger mount with it as well?

jonbot

I did

Apparently its been reco'd recently

$300 steal

deleted_user_160

If it's definatly out of a BA, it's the deal of the year

jonbot

I watched it being unbolted from a barra

That and the shifter is further back than the e series t5 I have here

Apparently the au box is also longer than the e series, only what Google has said though

deleted_user_160

Pity I got ride of the AU hey @Vee_Que‌ ;D

I'm not overly stressed now.
Mine has been in since November. And finally feeling solid but not stiff.
Other than the clutch/throw out bearing noise (which doesn't stress me) Im happy. 3rd could be a bit shorter, however that can easily be rectified with revised internals.

jonbot

Beauty of the t5

Gearbox by lego

deleted_user_160

Bahahaha. And a welth of parts to build for well over 800bhp.
Sadly though, no individual gears for straightcut, like they do for the ej20 boxes.

It's 1-5straigbtcut, or nothing.

jonbot

Meh, not as if its a daily

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